Add fallback for github release data (#13)

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = yen
-version = 0.4.1post1
+version = 0.4.2
 description = Yet another Python environment manager.
 long_description = file: README.md
 long_description_content_type = text/markdown
@@ -49,6 +49,7 @@ dev =
 yen =
 	py.typed
     activate.sh
+    fallback_release_data.json
 
 [tool:pytest]
 addopts = --cov --cov-report=term-missing

src/yen/__init__.py

@@ -48,7 +48,7 @@ def ensure_python(python_version: str) -> tuple[str, str]:
         # already installed
         return python_version, python_bin_path
 
-    os.makedirs(download_directory)
+    os.makedirs(download_directory, exist_ok=True)
     downloaded_filepath = download(
         download_link,
         f"Downloading {python_version}",

src/yen/github.py

@@ -1,6 +1,9 @@
 import json
+import os.path
 import platform
 import re
+import urllib.error
+from typing import Any
 from urllib.request import urlopen
 
 MACHINE_SUFFIX = {
@@ -22,19 +25,32 @@
 }
 
 GITHUB_API_URL = (
-    f"https://api.github.com/repos/indygreg/python-build-standalone/releases/latest"
+    "https://api.github.com/repos/indygreg/python-build-standalone/releases/latest"
 )
 PYTHON_VERSION_REGEX = re.compile(r"cpython-(\d+\.\d+\.\d+)")
 
 
+def fallback_release_data() -> dict[str, Any]:
+    """Returns the fallback release data, for when GitHub API gives an error."""
+    print("\033[33mWarning: GitHub unreachable. Using fallback release data.\033[m")
+    data_file = os.path.join(os.path.dirname(__file__), "fallback_release_data.json")
+    with open(data_file) as data:
+        return json.load(data)
+
+
 class NotAvailable(Exception):
     """Raised when the asked Python version is not available."""
 
 
 def get_latest_python_releases() -> list[str]:
     """Returns the list of python download links from the latest github release."""
-    with urlopen(GITHUB_API_URL) as response:
-        release_data = json.load(response)
+    try:
+        with urlopen(GITHUB_API_URL) as response:
+            release_data = json.load(response)
+
+    except urllib.error.URLError:
+        # raise
+        release_data = fallback_release_data()
 
     return [asset["browser_download_url"] for asset in release_data["assets"]]
 

yen-rs/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "yen-rs"
-version = "0.4.0"
+version = "0.4.2"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

yen-rs/src/github.rs

@@ -113,6 +113,8 @@ impl MachineSuffix {
     }
 }
 
+const FALLBACK_RESPONSE_BYTES: &[u8] = include_bytes!("../../src/yen/fallback_release_data.json");
+
 async fn get_latest_python_release() -> miette::Result<Vec<String>> {
     let response = YEN_CLIENT
         .get(*GITHUB_API_URL)
@@ -124,10 +126,11 @@ async fn get_latest_python_release() -> miette::Result<Vec<String>> {
     // Log the response body if the status is not successful
     let status_code = response.status().as_u16();
     let success = response.status().is_success();
-    let body = response.text().await.into_diagnostic()?;
+    let mut body = response.text().await.into_diagnostic()?;
     if !success {
         log::error!("Error response: {}\nStatus Code: {}", body, status_code);
-        miette::bail!("Non-successful API response, check the logs for more info.");
+        let fallback_response = String::from_utf8_lossy(FALLBACK_RESPONSE_BYTES).into_owned();
+        body = fallback_response;
     }
 
     // Attempt to parse the JSON